/* Ensures that a high-priority thread really preempts.

   Based on a test originally submitted for Stanford's CS 140 in
   winter 1999 by by Matt Franklin
   <startled@leland.stanford.edu>, Greg Hutchins
   <gmh@leland.stanford.edu>, Yu Ping Hu <yph@cs.stanford.edu>.
   Modified by arens. */

#include <stdio.h>
#include "tests/threads/tests.h"
#include "threads/init.h"
#include "threads/synch.h"
#include "threads/thread.h"

static thread_func simple_thread_func;

void test_priority_preempt(void)
{
    /* This test does not work with the MLFQS. */
    ASSERT(!thread_mlfqs);

    /* Make sure our priority is the default. */
    ASSERT(thread_get_priority() == PRI_DEFAULT);

    thread_create("high-priority", PRI_DEFAULT + 1, simple_thread_func, NULL);
    msg("The high-priority thread should have already completed.");
}

static void simple_thread_func(void *aux UNUSED)
{
    int i;

    for (i = 0; i < 5; i++)
    {
        msg("Thread %s iteration %d", thread_name(), i);
        thread_yield();
    }
    msg("Thread %s done!", thread_name());
}
